package PTA_JAVA.JavaBase.JavaBase22;

import java.util.Scanner;
public class Main{
    public static void main(String[] args){
        Scanner sc=new Scanner(System.in);
        Float a=sc.nextFloat(),b=sc.nextFloat(),c=sc.nextFloat();

        System.out.printf("aver=%.6f",(a+b+c)/3);
    }
}
